The document presents a case report of a 42-year-old female who presented with tetany. Laboratory investigations revealed hypocalcemia, hypomagnesemia, and hypokalemic metabolic alkalosis. She was diagnosed with Gitelman's syndrome, a rare autosomal recessive condition characterized by those electrolyte abnormalities. Gitelman's syndrome results from mutations causing downregulation of the thiazide-sensitive sodium-chloride cotransporter in the distal convoluted tubule. Treatment involves magnesium and potassium supplementation.